The daughter of the longest-living President tells of her family's quiet vigil

Feb. 6 will be my father's 91st birthday. The country and much of the world will be more aware of the occasion than he is. He has already passed a historic benchmark; he has lived longer than any other President.

What would he say about this? He might cock his head, smile, and say, "Well, this isn't exactly what I had in mind." Or perhaps something like, "All in all, I'd rather be horseback riding."

We will commemorate his birthday, speak of it, but the word "happy" won't be put in front of it. We are, after all, marking another year...